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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DataReference_h
#define DataReference_h
#include <WebCore/SharedBuffer.h>
#include <wtf/Vector.h>
namespace IPC {
class ArgumentDecoder;
class ArgumentEncoder;
class DataReference {
public:
DataReference()
: m_data(0)
, m_size(0)
{
}
DataReference(const uint8_t* data, size_t size)
: m_data(data)
, m_size(size)
{
}
template<size_t inlineCapacity>
DataReference(const Vector<uint8_t, inlineCapacity>& vector)
: m_data(vector.data())
, m_size(vector.size())
{
}
bool isEmpty() const { return size() == 0; }
size_t size() const { return m_size; }
const uint8_t* data() const
{
if (isEmpty())
return 0;
return m_data;
}
Vector<uint8_t> vector() const
{
Vector<uint8_t> result;
result.append(m_data, m_size);
return result;
}
virtual void encode(ArgumentEncoder&) const;
static bool decode(ArgumentDecoder&, DataReference&);
virtual ~DataReference() { }
private:
const uint8_t* m_data;
size_t m_size;
};
class SharedBufferDataReference : public DataReference {
public:
// FIXME: This class doesn't handle null, so the argument should be a reference or PassRef.
SharedBufferDataReference(WebCore::SharedBuffer* buffer)
: m_buffer(buffer)
{
}
private:
// FIXME: It is a bad idea to violate the Liskov Substitution Principle as we do here.
// Since we are using DataReference as a polymoprhic base class in this fashion,
// then we need it to be a base class that does not have functions such as isEmpty,
// size, data, and vector, all of which will do the wrong thing if they are called.
// Deleting these functions here does not prevent them from being called.
bool isEmpty() const = delete;
size_t size() const = delete;
const uint8_t* data() const = delete;
Vector<uint8_t> vector() const = delete;
virtual void encode(ArgumentEncoder&) const override;
RefPtr<WebCore::SharedBuffer> m_buffer;
};
} // namespace IPC
#endif // DataReference_h
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